Alarm-knob



(Model.)

E. C. GARLIGK.

ALARM KNOB.

No. 442,803 Patented Dec. 16, 1890.

UNITED STATES EDWARD GARLICK, OF CLEVELAND, OHIO, ASSIGNOR TO THF CUYAIIOGA MANUFACTURING COMPANY, OF SAME PLACE.

KNOB.

SPECIFICATION forming part of Letters Patent No. 442,803, dated December 16, 1890.

Application filed July 2l, 1890. Serial No. 359,452. (Model.)

To all whom it may concern:

Be it known that l, EDWARD C. GARLICK, a citizen of the United States, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented certain new and useful Improvements in Alarm-Knobs and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My improvement relates to alarm-knobs for doors in which a portion of the knob forms a gong or bell and the turning of the knob causes the alarm to strike g and the invention consists in the novel arrangement of parts by which the striking mechanism is attached to the knob-spindle independent of the knob itself, greater certainty of action is secured, the size of the knob is reduced, and the device is adapted to be attached to any door-lock or knob-latch in common use.

Figure l of the drawings shows the device attached to a door-lock asin use, the striking parts being shown in elevation and the knob and rose in vertical central section. Fig. 2 is a detached view of the spindle-bar and striking mechanism, showing the lower side thereof. Fig. 3 is an end elevation of the same with the gon g part of the knob attached. Fig. e is a transverse sectional view on the line .fr fc of the knob-shank. Fig. 5 is a plan view of the knob-rose, and Fig. 6 a section thereof on the line y y. Fig. 7 shows in perspective a detached view of all the striking parts except the hammer, and Fig. 8 is a like detached view of the striker-pin and stop-pin.

A represents the spindle-bar, which is of the usual standard size and construction.

B and B are the two parts of the shellwhich form the hollow knob, and either of which may act as the gong or bell. The outer shell B is iirmly secured to the end of the spindle-bar, as hereinafter described, and slightly overlaps the inner shell B', which is secured to or integral with the shank b, a slight space being left between the shells B IB at their periphery to give resonance to the part struck and allow its vibration. To the spindle-bar A is secured, within the hollow knob, a base-plate a, and to this base-plate is pivoted a strikingarm c, having a stop c', adapted to rest against the spindle A, against which it is normally held by a spring f. To the free extremity of the striking-arm c is pivotally attached the freely-moving hammer D, which normally falls back by gravity out of contact with the shell of the knob. Apawl or dog E is pivoted to the base-plate in such position that its free end bears against a shoulder c2 on the striking-arm when the latter is in its nor- 6o mal position, and the pawl is drawn forward by a spring g, bearing on an arm e of the pawl. The bearing of the pawl E on its pivot is an elon gate-d slot and allows the pawl to be forced back on` its pivot far enough to clear the shoulder c2 when moved by the stop-pin, as hereinafter described- The rose in which the knob bears differs from the usual form only in having a V-shaped groove 7.: cut across the bearing-surface. A pin L, designated as the 7o striker-pin, is inserted loosely through the knob-shank b', parallel with and close to the spindle A. One end of this pin is beveled on each side to fit the groove 7e in the rose, and the other end is adapted to bear against the pawl E and force it forward when the knob is turned. To enable the knob to be turned without striking the alarm, when so desired, astoppin 0 is inserted through the knobshank o', parallel with the striker-pin, in such position 8o that when pushed in by means ofalug or handlep its inner end will engage the rounded or beveled end of the pawl E and force the pawl to slide on its pivot, so as to be disengaged from the shoulder c2 of the sti'ikingariu. In this 85 position the pawl, when pushed forward by the striker-pin L on the turning of the knob, passes freely by the striking-arm, sliding on the pin o, and does not actuate the alarm.A A crossgroove m is cut from the slot in which the lug 9o p travels, and by turning the lug into this cross-groove the pin ois locked in position to prevent the alarm from sounding. On drawing back the pin 0 from engagement with the l pawl the spring g at once rest-ores the pawl to its operative position, in engagement with the shoulder c2 of the striking-arm.

rlhe operation of the device 'is as follows: The stop-pin being released and drawn back, the parts are in operative position. If either roo knob of the door is turned in either direction, the pin L will ride up the inclined face of the groove 7c in the rose, and being thus pushed int-o the knob will force forward the pawl E, thereby turning the striking-arm on its pivot and compressing the springf until thestriking-arm has turned far enough to letthe pawl slip off the shoulder c2, when the spring f will throw forward the striking-arm, bringing its stop c against the spindle A, and causing the hammer Dto fly up and strike a quick sharp blow upon the shell of the knob, falling back out of Contact by its own weight. The proportions of the parts aresuch that the striking-arm will be released before the knob has turned far enough to wholly withdraw the latch-bolt. IIence the alarm must strike before the door can be opened, unless the stoppin has been set and locked, as above described, which can only be done from the inner side of the door, to which the alarm-knob is attached. As soon asthe alarm strikes, the spring g draws back the pawl E into reengagement with the shoulder e2 ready for another stroke.

In order to prevent the shells B from eomingin contact at their edges, which would destroy the vibration of the gong when struck, it is essential to secure the correct centering of the outer shell B with the spindle7 unless a wide and unsightly opening isleft between the two shells. At the same time, since the shellB is the part grasped by the hand it must be very firmly and solidly secured to the spindle to prevent its being bent or displaced orloosened. To accomplish these ends I turn the shoulder 7L on the end of the spindle, central therewith, and form a boss or short central stem on the inside of the shell B, which is centered and drilled to receive the shoulder 71.. A cross-groove r is milled out across the inner end of the stem t' to exactly iit the square body of the spindle A. The end of the shoulder 71. is tapped to receive a screw s, which in mounting the shell B on the spindle is turned in from the outside and binds the shell iirmly on the spindle. The screw s is preferably made of the same material as the shell B, and when turned firmly into place is cut. or ground off even with the outer surface of the knob, and when the knob is finished in the usual manner the screw is wholly undistinguishable and cannot be removed by any ordinary means, but locks the spindle in place with the utmost rigidity.

By dispensing with cranks or slides attached to the knob and acting crosswise thereof I am enabled to use a smaller knob than has before been practicable, and by dispensing with rigid or spring hammers and employing the loose gravitating hammer I avoid the deadening of the blow by the wear 0r set of the hammer-arm allowing it to come too close to or in contact with the bell.

That I claim, and desire to secure by Letters Patent, is

l. An alarm-knob consisting of a hollow shell adapted to act as a gong or bell and having the striking mechanism secured to the spindle of the knob within the shell and operated by a sliding pin actuated by an inclined face on the rose-plate, substantially as described.

2. An alarm-knob consisting of a hollow shell adapted to actas a gong or bell and having Within the shell the striking mechanism secured to the spindle and in its shank the operating-pin engaging an inclined face on the rose-plate, and a stop-pin adapted to set and lock the striking` mechanism Aout of engagement, substantially as described.

3. In an alarm-knob, the combination of a hollow shell adapted to act as a bell, the striking mechanism attached to the spindle within the shell and having the loosely-pivoted striking-hammer, the sliding pin with beveled end inserted iuthe knob-shank, and the rose-plate with inclined face for actuating the pin, substantially as described.

4. The combination, with the hollow knob adapted to act as a bell, of the alarm mechanism consisting of a base-plate secured to the spindle, the striking-ann pivoted to the base-plate and having the striking-hammer loosely pivoted to its free end, the pawl pivoted to the base-plate and engaging the striking-arm, the sliding pin adapted to bear upon and push forward the pawl, the inclined face on the rose-plate to actuate the pin, and a stop-pin adapted to force the pawl out of engagement with the striking-arm and to be locked in that position, substantially as de scribed.

5. In an alarm-knob, the combination, with the hollow knob adapted to act asa bell and having attached to its spindle the base-plate a, with striking-arm and pawl pivoted thereto, of the gravitating hammer pivoted to the striking-arm, substantially as described.

6. In an alarm-knob, the combination of the knob-shell havinga centralinternal stern with central bearing adapted to receive the shoulder of the spindle, and transverse groove adapted to iit the squared faces of the spindle, with the spindle having a shoulderitting the central bearing of the stem and a squared portion fitting the transverse groove thereof to prevent the turning of the knob on the spindle, substantially as described.

In testimony whereofI affix my signature in presence of two witnesses.

EDXVARD C. GARLICK.

lXTitiiesses:

LoRIN PRENTIss, WM. G. TAYLOR.

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